Electronically Steerable Planar Phase Array Antenna Using Liquid Crystal
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Solution Overview
Problem
Existing steerable antennas for mobile terminals are bulky, have slow beam steering speed, are sensitive to gravitational force, and require high maintenance due to mechanical systems, while electronically steerable phased array antennas are costly due to expensive electronics and complex phase shifter designs.
Innovation Solution
A low-profile, two-dimensional electronically steerable phased array antenna using a stack of dielectric substrates with integrated electronically tunable phase shifters and a biasing network, utilizing liquid crystal or barium strontium titanate as variable dielectrics, to achieve continuous beam steering with reduced fabrication costs and improved compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanically controlled steerable antennas are used, then the antenna can be adjusted in elevation and azimuth planes, but the system becomes bulky, slow, sensitive to gravity, and requires high maintenance
Solution Approach 1:
The patent replaces mechanical steering systems with an electronically controlled phased array system. Instead of physically moving the antenna elements using motors and mechanical joints, the invention uses electronic phase shifters to control the beam direction. This substitution eliminates mechanical complexity, reduces size, removes sensitivity to gravity, and enables faster beam steering while maintaining full elevation and azimuth adjustment capability.
Solution Approach 2:
The patent implements dynamic beam steering through electronic phase control rather than static mechanical positioning. The phased array system can rapidly change beam direction by electronically adjusting phase shifts across array elements, enabling fast and flexible beam steering without mechanical movement. This dynamic control approach provides adaptability and responsiveness that mechanical systems cannot achieve.
2Speed
If electronically steerable phased array antennas are used, then beam steering speed is improved and mechanical sensitivity is eliminated, but the cost increases due to expensive electronics
Solution Approach 1:
The patent changes the material parameter of the phase shifters from conventional expensive semiconductor or MEMS materials to liquid crystal materials. Liquid crystals offer the necessary phase shifting capability at significantly lower cost while maintaining the electronic beam steering function. This parameter change in material selection directly addresses the cost issue while preserving the high beam steering speed advantage of electronic systems.
Solution Approach 2:
The patent employs liquid crystal phase shifters which are considerably cheaper than traditional semiconductor or MEMS-based phase shifters. Although liquid crystals may have different longevity characteristics, their low cost enables economical phased array implementation, making electronic beam steering accessible for cost-sensitive applications while maintaining fast steering performance.
3Ease of operation
If conventional phase shifters are used, then electronic beam steering is achieved, but the fabrication cost remains high
Solution Approach 1:
The patent replaces expensive conventional phase shifter technologies (semiconductor, MEMS) with liquid crystal-based phase shifters that are considerably cheaper to manufacture. This substitution maintains full electronic beam steering functionality while dramatically reducing fabrication costs, making the technology economically viable for a broader range of applications.
Solution Approach 2:
The patent changes the fundamental material parameter of the phase shifter from expensive solid-state materials to liquid crystal materials. This material parameter change enables the same electronic beam steering operation at a fraction of the cost, directly resolving the contradiction between operational capability and manufacturing expense.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a cost-effective, lightweight, and aesthetically pleasing antenna with improved beam steering speed and reliability, suitable for mobile terminals, capable of continuous steering in one or two dimensions for wireless internet and broadcasting services.
Implementation Method 1
a voltage tunable phase shifter whose low loss dielectric material can be tuned with an applied voltage
Implementation Method 2
Effective dielectric constant of LC depends on the orientation of the molecules with respect to the RF-field. Desired orientation of the molecules, i.e. parallel or perpendicular to the RF-field, can be accomplished by using surface treatments or electrostatic field.
Data Source
AI summary
A two-dimensional (2-D) beam steerable phased array antenna is presented comprising a continuously electronically steerable material including a tunable material or a variable dielectric material, preferred a liquid crystal material. A compact antenna architecture including a patch antenna array, tunable phase shifters, a feed network and a bias network is proposed. Similar to the LC display, the proposed antenna is fabricated by using automated manufacturing techniques and therefore the fabrication costs are reduced considerably.